Recursion + Promises by the brilliant @nhunzaker

recursivepromises.js

function harvest(id, parent) {
    var promise = $.Deferred();
    var post;

    request({
  	url: "...",
	json: true,
        timeout: 30000
    }, function(error, response, body) {

        if (error) return console.log("CRAP");

	// Enter the pseudocode....
	post = JSON.parse(body);
	post.children = [];

	// Now assign this post to a parent if it was specified
	if (parent) {
      	  parent.children.push(post);
	}
    
        // Now for each reblog (or whatever it's called) do it again,
        // which will assign a parent id, but also this will return
	// a promise that we'll use to determine if children are finished
	var promises = posts.reblogs.map(function(reply) {
	
	    // Go out and get the reply, which will assign the
	    // post's id as the parent attribute
            return harvest(reply, post);
        });

 	$.when.apply($, promises).then(function() {
		promise.resolve(post);
	});
    });

    return promise;
}

var posts;
harvest("your seed id").done(function(data) {
    posts = data;
});